[7479] in Athena Bugs
decmips 7.2R: putc, fputc
daemon@ATHENA.MIT.EDU (Jonathan I. Kamens)
Sun Apr 28 17:28:29 1991
Date: Sun, 28 Apr 91 17:28:13 EDT
From: "Jonathan I. Kamens" <jik@pit-manager.MIT.EDU>
To: bugs@ATHENA.MIT.EDU
System name: hodge
Type and version: KN01 7.2R
Display type: PM-MONO
What were you trying to do?
Use the putc and fputc library routines to write the char 0xff
to a file.
What's wrong:
Fputc and putc both return -1 (i.e. (int) (char) 0xff, if the
default char type is signed) rather than returning 255.
Unfortunately -1 is EOF, which is what the functions are
supposed to return when they are trying to signal an error,
which means they signal an error when there is none.
What should have happened:
The argument to fputc and putc should be converted to unsigned
char before it is sent to the file or returned. This is what
the ANSI C standard says should happen, and this is what in
fact should happen if this problem is to be avoided.
If this is not fixed in Ultrix 4.0, it should be sent back to
DEC.
jik
